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Estimation of Damage in an Underground Mine Due to Effect of Surface Blasting



Author(s)

Ajay Kumar Jha and Debasis Deb

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DOI:10.17265/2328-2193/2015.04.005

Variable Scaling laws predict the blast induced damage in more effective way as compared to fixed scaling law. This study finds that depending on the number and composition of rock strata through which stress waves are transmitted from the surface to underground, Q^0.35 factors may be appropriate for estimating the scaled distance, which is considered as a measure of PPV (peak particle velocity). Further a new approach is proposed to classify damage of underground structures into three groups (Severe, Moderate, No) using the concept of “Blast Damage Factor” and linear discriminant functions. Site-specific charts between charge weight and distance have been developed so that blasting at a surface mine can be conducted without causing damage to the adjacent underground mine. The study observed that severe roof damage in case study minesite took place when PPV will exceed 54.04 mm/s and moderate damage is expected if PPV ranges between 44.68 mm/s and 54.04 mm/s. Any PPV less than 20.00 mm/s will produce no damage to underground structures.

Surface blasting, peak particle velocity, predictor equation, blast damage factor.